"Last November, when I was still a Rockies beat writer, I opined that catcher Chris Iannetta was the one player who must improve significantly in order for the Rockies to win the National League West in 2010.

With Yorvit Torrealba gone, I feel even more strongly about that, regardless of how much newcomer Miguel Olivo contributes.

Rockies pitchers and catchers report to spring training in Tucson on Feb. 18. Beginning that day, Iannetta must become a leader. He needs to take charge of the pitching staff.

As for his power at the plate, this is what I wrote back in November: "I think Iannetta is the one player who could turn the Rockies into a team every bit as dangerous as the Phillies."

That's my take as the Rockies muscle up and stretch out for a season bubbling over with optimism and anticipation.

So Rockheads, what's your opinion? Who is your Rockie on the hot seat?"